Ceph Nautilus : Configure Ceph Cluster #12021/03/31

Install Distributed File System Ceph to Configure Storage Cluster.

For example on here, Configure Ceph Cluster with 3 Nodes like follows.
Furthermore, each Storage Node has a free block device to use on Ceph Nodes.
(use [/dev/sdb] on this example)

                                         |
            +----------------------------+----------------------------+
            |                            |                            |
            |10.0.0.51                   |10.0.0.52                   |10.0.0.53 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.world]  |    |   [node02.srv.world]  |    |   [node03.srv.world]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|     Manager Daemon    |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

[1]	Generate SSH key-pair on [Monitor Daemon] Node (call it Admin Node on here) and set it to each Node. Configure key-pair with no-passphrase as [root] account on here. If you use a common account, it also needs to configure Sudo. If you set passphrase to SSH kay-pair, it also needs to set SSH Agent.

[root@node01 ~]#

ssh-keygen

Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:cFNKujKBUJZnuJFlnQJvdbfQQpYq+JCigVl1gsX0DJY root@node01.srv.world
The key's randomart image is:
.....
.....

[root@node01 ~]#

vi ~/.ssh/config

# create new (define each Node and SSH user)

Host node01
    Hostname node01.srv.world
    User root
Host node02
    Hostname node02.srv.world
    User root
Host node03
    Hostname node03.srv.world
    User root

[root@node01 ~]#

chmod 600 ~/.ssh/config

# transfer public key

[root@node01 ~]#

ssh-copy-id node01

root@node01.srv.world's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node01'"
and check to make sure that only the key(s) you wanted were added.

[root@node01 ~]#

ssh-copy-id node02

[root@node01 ~]#

ssh-copy-id node03

[2]	Install Ceph to each Node from Admin Node.

[root@node01 ~]# for NODE in node01 node02 node03
do
    ssh $NODE "dnf -y install centos-release-ceph-nautilus; dnf -y install ceph"
done

[3]	Configure [Monitor Daemon], [Manager Daemon] on Admin Node.

[root@node01 ~]#

uuidgen

ea021e0d-d3ac-45b0-b4b6-c1174aa3966b

# create new config

# file name ⇒ (any Cluster Name).conf

# set Cluster Name [ceph] (default) on this example ⇒ [ceph.conf]

[root@node01 ~]#

vi /etc/ceph/ceph.conf

[global]
# specify cluster network for monitoring
cluster network = 10.0.0.0/24
# specify public network
public network = 10.0.0.0/24
# specify UUID genarated above
fsid = ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
# specify IP address of Monitor Daemon
mon host = 10.0.0.51
# specify Hostname of Monitor Daemon
mon initial members = node01
osd pool default crush rule = -1

# mon.(Node name)
[mon.node01]
# specify Hostname of Monitor Daemon
host = node01
# specify IP address of Monitor Daemon
mon addr = 10.0.0.51
# allow to delete pools
mon allow pool delete = true

# generate secret key for Cluster monitoring

[root@node01 ~]#

ceph-authtool --create-keyring /etc/ceph/ceph.mon.keyring --gen-key -n mon. --cap mon 'allow *'

creating /etc/ceph/ceph.mon.keyring

# generate secret key for Cluster admin

[root@node01 ~]#

ceph-authtool --create-keyring /etc/ceph/ceph.client.admin.keyring --gen-key -n client.admin --cap mon 'allow *' --cap osd 'allow *' --cap mds 'allow *' --cap mgr 'allow *'

creating /etc/ceph/ceph.client.admin.keyring

# generate key for bootstrap

[root@node01 ~]#

ceph-authtool --create-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring --gen-key -n client.bootstrap-osd --cap mon 'profile bootstrap-osd' --cap mgr 'allow r'

creating /var/lib/ceph/bootstrap-osd/ceph.keyring

# import generated key

[root@node01 ~]#

ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /etc/ceph/ceph.client.admin.keyring

importing contents of /etc/ceph/ceph.client.admin.keyring into /etc/ceph/ceph.mon.keyring
[root@node01 ~]#

ceph-authtool /etc/ceph/ceph.mon.keyring --import-keyring /var/lib/ceph/bootstrap-osd/ceph.keyring

importing contents of /var/lib/ceph/bootstrap-osd/ceph.keyring into /etc/ceph/ceph.mon.keyring

# generate monitor map

[root@node01 ~]#

FSID=$(grep "^fsid" /etc/ceph/ceph.conf | awk {'print $NF'})

[root@node01 ~]#

NODENAME=$(grep "^mon initial" /etc/ceph/ceph.conf | awk {'print $NF'})

[root@node01 ~]#

NODEIP=$(grep "^mon host" /etc/ceph/ceph.conf | awk {'print $NF'})

[root@node01 ~]#

monmaptool --create --add $NODENAME $NODEIP --fsid $FSID /etc/ceph/monmap

monmaptool: monmap file /etc/ceph/monmap
monmaptool: set fsid to ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
monmaptool: writing epoch 0 to /etc/ceph/monmap (1 monitors)

# create a directory for Monitor Daemon

# directory name ⇒ (Cluster Name)-(Node Name)

[root@node01 ~]#

mkdir /var/lib/ceph/mon/ceph-node01

# assosiate key and monmap to Monitor Daemon

# --cluster (Cluster Name)

[root@node01 ~]#

ceph-mon --cluster ceph --mkfs -i $NODENAME --monmap /etc/ceph/monmap --keyring /etc/ceph/ceph.mon.keyring

[root@node01 ~]#

chown ceph. /etc/ceph/ceph.*

[root@node01 ~]#

chown -R ceph. /var/lib/ceph/mon/ceph-node01 /var/lib/ceph/bootstrap-osd

[root@node01 ~]#

systemctl enable --now ceph-mon@$NODENAME

# enable Messenger v2 Protocol

[root@node01 ~]#

ceph mon enable-msgr2

# enable Placement Groups auto scale module

[root@node01 ~]#

ceph mgr module enable pg_autoscaler --force

# create a directory for Manager Daemon

# directory name ⇒ (Cluster Name)-(Node Name)

[root@node01 ~]#

mkdir /var/lib/ceph/mgr/ceph-node01

# create auth key

[root@node01 ~]#

ceph auth get-or-create mgr.$NODENAME mon 'allow profile mgr' osd 'allow *' mds 'allow *'


[mgr.node01]
        key = AQCaxWNghWOyMBAAxKkUECOrrp6LcF1zg0Yt1w==

[root@node01 ~]#

ceph auth get-or-create mgr.node01 > /etc/ceph/ceph.mgr.admin.keyring

[root@node01 ~]#

cp /etc/ceph/ceph.mgr.admin.keyring /var/lib/ceph/mgr/ceph-node01/keyring

[root@node01 ~]#

chown ceph. /etc/ceph/ceph.mgr.admin.keyring

[root@node01 ~]#

chown -R ceph. /var/lib/ceph/mgr/ceph-node01

[root@node01 ~]#

systemctl enable --now ceph-mgr@$NODENAME

[4]	On Admin Node, If Firewalld is running, allow service ports.

[root@node01 ~]#

firewall-cmd --add-service=ceph-mon --permanent

success
[root@node01 ~]#

firewall-cmd --reload

success

[5]	Confirm Cluster status. That's OK if [Monitor Daemon] and [Manager Daemon] are enabled like follows. For OSD (Object Storage Device), Configure them on next section, so it's no problem if [HEALTH_WARN] at this point.

[root@node01 ~]#

ceph -s

  cluster:
    id:     ea021e0d-d3ac-45b0-b4b6-c1174aa3966b
    health: HEALTH_OK

  services:
    mon: 1 daemons, quorum node01 (age 3m)
    mgr: node01(active, since 20s)
    osd: 0 osds: 0 up, 0 in

  data:
    pools:   0 pools, 0 pgs
    objects: 0 objects, 0 B
    usage:   0 B used, 0 B / 0 B avail
    pgs:

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